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Will Shortz Presents Black Diamond Sudoku: 200 Extreme Puzzles MTO DOVER_APR58 Soups and Snacks in oneWatch out! These puzzles are for the most extreme solvers! But if you dare, grab a pen and take on these two hundred all new extra challenging puzzles in Will Shortz Presents Black Diamond Sudoku. Features: 200 hard puzzles Big grids for easy solving Introduction by legendary puzzlemaster Will Shortz